wtf are gang vocals? like layered vocals? yea, people do it all the time. you just do separate tracks. you could elaborate a bit more so people actually know what the hell you're talking about.
Assuming you have some form of multi track recording device, you can just do 4-8 tracks of just yourself but it probably won't sound totally the same. Don't you have any friends?
"There he goes. One of God's own prototypes. Some kind of high powered mutant never even considered for mass production. Too weird to live, and too rare to die."-Duke
yeah just overdub yourself a bunch of times and slightly detune and tweak the EQ of each overdub so they all sound a little different.
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....in seriousness, just record you singing a few times in different pitches. reverb, perhaps?